/*
 * Copyright 2007 Peter Zelenay.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 */
package net.zelenay.jcrviewer.tree;

import java.io.File;

/**
 * 
 * @author Peter Zelenay
 *
 */
public class FilesystemExplorer implements NodeProvider {

	private String root;

	public FilesystemExplorer(String root) {
		this.root = root;
	}

	public AsyncNode[] getChild(AsyncNode parent) {
		Object obj = parent.getUserObject();
		if (obj == null || !(obj instanceof File)) {
			// parent
			parent.setUserObject(new File(root));
		}
		File parentFile = (File) parent.getUserObject();
		File[] list = parentFile.listFiles();
		AsyncNode[] nodes = new AsyncNode[list.length];
		AsyncNode[] filesOnly = new AsyncNode[list.length];
		int filesCount = 0;
		int dirCount = 0;
		for (int i = 0; i < list.length; i++) {
			File item = list[i];
			AsyncNode node = new AsyncNode(item, item.isDirectory());
			if (item.isDirectory()) {
				nodes[dirCount++] = node;
			} else {
				filesOnly[filesCount++] = node;
			}
		}
		for (int j = 0; j < filesCount; j++) {
			nodes[dirCount + j] = filesOnly[j];
		}
		return nodes;
	}

}
